There are no plug'n'play options available for F15 because for this model BMW decided to make a completely different platform for the speakers, so everyone has to design from scratch. BAVSound are indeed working on a PnP version of their speakers (probably others like Focal do as well), but I don't know how close they are...
I've had a very productive conversation with guys I trust with BMW sound upgrades in a different country - if I were to pull the plug it would cost me circa EUR 4.3k just for the equipment+labour, but this system would blow even B&O out of the water...
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